Deaeration Valve and Compression Bag Equipped Therewith

ABSTRACT

A deaeration valve comprising two valve films  11, 12  of synthetic resin that put one on the other, having an air passage  2  defined by two seal sections  21, 22  formed by means of bonding parts of the valve films together, wherein the inlet  2   a  of the air passage  2  is defined by the straight line linking the respective upward flow side end sections  21   a,    221   a  of the seal sections  21, 22 ; the outlet  2   b  of the air passage is defined by the straight line linking the respective downward flow side end sections  21   b,    223   b  of the seal sections  21, 22 ; and in at least one of the seal sections  21, 22 , the valve films  11, 12  are not bonded together at the line of extension  21   c,    223   c  of the seal section  21, 22 , situated on the downward flow side of the downward flow side end section  21   b,    223   b  of the seal section  21, 22.

FIELD OF THE INVENTION

The present invention relates to a deaeration valve using two valvefilms made of synthetic resin, which is able to pass an airflow in onedirection, and to a compression bag equipped with this deaeration valve.

BACKGROUND ART

Patent Reference No. 1: JP utility model application laid-open No.H06-697

Conventionally, compression bags are known in which an item for storagewhich is bulky as a result of containing air, such as clothing, beddingor the like, is contained, and then compressed by expelling the aircontained therein, in such a manner that the item can be stored in acompact fashion.

The compression bag is provided with an opening for introducing andremoving the item for storage, and this opening can be closed to sealoff the interior of the bag hermetically, by means of a zip fastener orthe like. Many compression bags are provided with deaeration valveshaving an air passage for expelling air from the interior of the bag.

There are deaeration valves having a composition in which two valvefilms made of synthetic resin are superimposed on each other. In thesevalves, rectangular valve films are used, and an air passage is providedby seal sections formed by bonding the longitudinal side edges of thevalve films together, and air is allowed to pass through the two valvefilms from an inlet to an outlet, and the air passage is closable by thetwo valve films that closely contact together.

This deaeration valve has a simple structure, but there are drawbacks inslackening of the valve films and inverse flow of air. One of thereasons for this slackening is thought to be local instability in thetension of the valve films which occurs as a result of the fixedpositional relation between the films in the aforementioned sealsections.

On the other hand, in one example of a device aimed at preventinginverse flow in a deaeration valve having the aforementioned structure,the patent reference No. 1 proposes bending of the air passage. However,although this deaeration valve makes it less liable for inverse flow tooccur, it does not resolve the aforementioned problem, namely, the factthat the valve films are fixed together in the seal sections, therebyproducing local instabilities in the tension of the valve films.

In view of the circumstances, it is an object of the present inventionto provide a deaeration valve, and a compression bag equipped with adeaeration valve, whereby the tension of the valve film can bestabilized, and inverse flow of air can be prevented effectively inspite of a simple structure.

DISCLOSURE OF THE INVENTION

In order to achieve the aforementioned object, a first aspect of thepresent invention according to claim 1 provides a deaeration valve 1comprising two films 11, 12 of synthetic resin that are placed one onthe other and bonded at parts thereof together. An air passage 2 isformed that allows to pass air through the valve films from an inlet 2 ato an outlet 2 b and closable by means of the valve films 11, 12 thatclosely contact together. The air passage 2 is defined by two sealsections 21, 22, which are formed by bonding the valve films 11, 12together. The inlet 2 a of the air passage 2 is defined by the straightline linking respective upward flow side end sections 21 a, 221 a of theseal sections 21, 22, while the outlet 2 b of the air passage 2 isdefined by the straight line linking respective downward flow side endsections 21 b, 223 b of the seal sections 21, 22. At least one of thedownward flow side end sections 21 b, 223 b of the seal sections 21, 22and the downward flow side edges 11 b, 12 b of the valve films 11, 12are separated. A passage extension section 31 is provided on thedownward flow side of the air passage 2, and is defined by the outlet 2b of the air passage 2, the line of extension 21 c, 223 c of the sealsection 21, 22 on the downward flow side from the downward flow side endsection 21 b, 223 b of at least one of the seal sections 21, 22, and thedownward flow side edges 11 b, 12 b of the valve films 11, 12. The valvefilms 11, 12 are not bonded together at the lines of extension 21 c, 223c.

A second aspect of the present invention according to claim 2 providesthe deaeration valve 1 according to claim 1, which further comprises anon-sealed section 3 comprising a passage extension section 31 and afree section 32. The free section 32 is adjacent to the passageextension section 31 or to the air passage 2 and the passage extensionsection 31. The passage extension section 31 and the free section 32 arebounded by the line of extension 21 c, 223 c that defines the passageextension section 31. The portions of valve film 11, 12 constituting thepassage extension section 31 and the free section 32 form a single body.

A third aspect of the present invention according to claim 3 providesthe deaeration valve according to claim 1 or 2, wherein the dimension L2b between the respective end sections of the first side seal section 21and the second side seal section 22 at the outlet of the air passage 2is smaller than the dimension L2 a between the respective end sectionsat the inlet of the air passage 2.

A fourth aspect of the present invention according to claim 4 providesthe deaeration valve according to claim 3, wherein the first side sealsection 21 has a linear form, and the second side seal section 22comprises three sections that are an introduction section 221, anintermediate section 222, and an expulsion section 223. The intermediatesection 222 connects between the introduction section 221 and theexpulsion section 223. Regarding the second side seal section 22, theintermediate section 222 is formed closer to the first side seal section21 than the introduction section 221, and the expulsion section 223 isformed closer to the first side seal section 21 than the intermediatesection 222. The inlet 2 a of the air passage 2 is defined by the upwardflow side end section 221 a of the introduction section 221 and theupward flow side end section 21 a of the first side seal section 21,while the outlet 2 b of the air passage 2 is formed by the downward flowside end section 223 b of the introduction section 223 and the downwardflow side end section 21 b of the first side seal section 21. Thedownward flow side end section 223 b of the second side seal section 22is formed further towards the upward flow side than the downward flowside end section 21 b of the first side seal section 21. The freesection 32 being formed adjacent to the air passage 2 and the passageextension section 31 is provided.

A fifth aspect of the present invention according to claim 5 providesthe deaeration valve according to any one of claims 1 to 4, wherein, inthe air passage 2, the upward flow side edge 11 a, 12 a of the valvefilms 11, 12 that are placed one on the other, and the upward flow sideedge 12 a, 11 a of the other of the valve films 12, 11 are disposed atleast respectively in staggered positions towards the upward flow sideand the downward flow side.

A sixth aspect of the present invention according to claim 6 providesthe deaeration valve according to any one of claims 1 to 5, wherein aninert liquid 4 such as silicon oil is disposed on at least part of theinner surfaces of the valve films 11, 12 in the air passage 2.

A seventh aspect of the present invention according to claim 7 providesa compression bag equipped with a deaeration valve. As a compression bag5, it is formed with at least two bag films 51, 52 of synthetic resinthat are placed one on the other and bonded at parts thereof together.The compression bag comprises a storage section 62 provided with anopening 61, and a deaeration opening 63 for removing air in the storagesection 62 other than the opening 61. The storage section 62 is able tocontain an item for storage. The respective bag films 51, 52 have arectangular shape in a plan view. The opening 61 is provided in theupper part of the compression bag 5 and is hermetically closable by aclosing means 61 a, while the deaeration opening 63 is provided in thelower part of the compression bag 5. A deaeration valve 1 according toany one of claims 1 to 6 is installed between the storage section 62 andthe deaeration opening 63 with the inlet side of the air passage 2towards the top and the outlet side towards the bottom. The installationof the deaeration valve 1 is achieved by forming a unifying seal section64 where the valve films 11, 12 and the bag films 51, 52 are bondedtogether. Except through the air passage 2, air is prevented fromflowing between the storage section 62 and the deaeration opening 63. Aheat resistant coating 7 is disposed on at least part of the innersurfaces of the valve films 11, 12 in the air passage 2, and the part istaken in a portion that coincides with the unifying seal section 64.

An eighth aspect of the present invention according to claim 8 providesthe compression bag equipped with a deaeration valve according to claim7, wherein elongate films are used for the valve films 11, 12 and aplurality of the deaeration valves 1 are disposed parallel in thelengthwise direction of the valve films 11, 12 in such a manner that theair passages 2 and free sections 32 are respectively adjacent.

A ninth aspect of the present invention according to claim 9 providesthe compression bag equipped with a deaeration valve according to claim7 or 8, wherein the storage section 62 comprises an item storage portion62 a and an air introduction portion 62 b, and the portions 62 a, 62 bare bounded by a valve protection seal 67. The valve protection seal 67is formed by bonding the bag films 51, 52 together. Air is allowed topass between the item storage section 62 a and the air introductionportion 62 b.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(A) is a plan view showing a deaeration valve relating to oneembodiment of the present invention; FIG. 1(B) is a schematiccross-sectional view along line A-A in FIG. 1(A), when the air passageis open; and FIG. 1(C) is a schematic cross-sectional along line A-A inFIG. 1(A), when the air passage is closed.

FIG. 2 shows a deaeration valve relating to one embodiment of thepresent invention during deaeration, in which FIG. 2(A) is a plan viewof the feature of the valve; FIG. 2(B) is a schematic cross-sectionalview along B-B in FIG. 2(A); FIG. 2(C) is a schematic cross-sectionalview along C-C in FIG. 2(A); and FIG. 2(D) is a schematiccross-sectional view along D-D in FIG. 2(A).

FIG. 3 shows a deaeration valve relating to one embodiment of thepresent invention, when deaeration has finished, in which FIG. 3(A) is aplan view; and FIG. 3(B) is a schematic cross-sectional view along B-Bin FIG. 3(A), showing a state where the valve is installed on acompression bag.

FIG. 4 shows a deaeration valve relating to one embodiment of thepresent invention, after finishing deaeration, in which FIG. 4(A) is aplan view of the feature of the valve; FIG. 4(B) is a schematiccross-sectional view along F-F in FIG. 4(A), showing a state where thevalve is installed on a compression bag; FIG. 4(C) is a schematiccross-sectional view along G-G in FIG. 4(A); and FIG. 4(D) is aschematic cross-sectional view along H-H in FIG. 4(A).

FIG. 5(A) is a plan view showing a deaeration valve relating to afurther embodiment of the present invention; FIG. 5(B) is a schematiccross-sectional view along line I-I in FIG. 5(A), when the air passageis open; and FIG. 5(C) is a schematic cross-sectional along line I-I inFIG. 5(A), when the air passage is closed.

FIG. 6 is a plan view showing a compression bag equipped with adeaeration valve relating to one embodiment of the present invention.

FIGS. 7(A)-7(H) are schematic plan view 6 showing other embodiments of adeaeration valve relating to the present invention.

BEST MODE TO PRACTICE THE INVENTION

One embodiment of the present invention will be described below withreference to the drawings. FIG. 1 is a plan view showing a deaerationvalve according to the present embodiment, and FIG. 6 is a plan viewshowing a compression bag equipped with the deaeration valve of thepresent embodiment. The expressions “upward flow” and “downward flow” inthe following description are based on the direction of the air flowwhen the air passage is open as shown in FIG. 1(B), and expressionsindicating up, down, left and right relate to the positional situationshown in FIG. 1(A) and FIG. 6. Further, in expressions relating to“front” and “rear”, “front” indicates the upper side in the state shownin FIGS. 1(B) and 1(C), and “rear” indicates the lower side in thesedrawings.

As shown in FIG. 1(A), the deaeration valve 1 according to the presentembodiment is open with respect to air flow f1 in one direction from theupper side to the lower side (see FIG. 1(B)), and it is closed withrespect to air flow f2 in the other direction from the lower side to theupper side (see FIG. 1(C)). This deaeration valve 1 is principallyattached to a compression bag 5 such as that shown in FIG. 6, and isused in order to remove air in the storage section 62 of the compressionbag 5. Equipping of this deaeration valve 1 is not limited to acompression bag as in the present embodiment, and it may also be appliedto a bag that is used to be filled with gases such as air. Further, thedeaeration valve 1 may also be used as a check valve for general fluidssuch as gases other than air and liquids such as water.

The deaeration valve 1 according to the present invention comprises twovalve films 11 and 12 of synthetic resin that are placed one on theother. In these valve films 11 and 12, desirably, at least the surfacesforming the inner faces of the air passage 2 have weak contact property,thereby making the valve films 11 and 12 readily contact together. Thevalve films 11 and 12 used in the present embodiment have a rectangularshape as shown in FIG. 1, but they may also have another shape.

By bonding together a portion of the valve films 11 and 12, for example,by heat seal, an air passage 2 is provided where air allows to passthrough the valve films 11 and 12 from an inlet 2 a to an outlet 2 b,and it is closable by the valve films 11 and 12 that closely contacttogether. This air passage 2 is defined by the two seal sections 21, 22formed by bonding the valve films 11 and 12 together.

When the air flow f1 passes in the aforementioned direction, as shown inFIG. 1(B), the valve films 11 and 12 are pushed apart forcibly andopened by the air flow f1. However, in all other cases, the valve films11 and 12 closely contact together, as shown in FIG. 1(C). Therefore,the air passage 2 maintains a closed state in which the air flow f2 inthe other direction does not allow to pass. The detailed movement of thevalve films 11 and 12 with the air passage 2 closed will be describedhereinafter.

In the present embodiment, the air passage 2 is constituted by the twovalve films 11 and 12, but as shown in FIG. 5, a structure may also beadopted in which an intermediate film 13 is disposed between the twovalve films 11 and 12, wherein the base end side of the intermediatefilm 13 is bonded to the rear side valve film 12, as shown in FIG. 5(B),and the front end side thereof is movable inside the air passage 2 andable to make a close contact to the front side valve film 11, as shownin FIG. 5(C). The air passage 2 may have a structure to be closable bythe intermediate film 13 and the front side valve film 11 that closelycontact together, in addition to the close contact between the valvefilms 11 and 12 described above. In the example illustrated here, thedownward flow side edge of the intermediate film 13 is positionedfurther toward the upward flow side than the downward flow side edges 11b and 12 b of the valve films 11 and 12, but it is also possible for thepositions of the respective edges 11 b, 12 b and 13 b to be aligned witheach other.

In the illustrated structure, desirably, the opposing faces of the rearside valve film 12 and the intermediate film 13, which are separatedexcept the base end section when the air passage 2 is closed, do nothave a weak contact property in order to make the films 12 and 13 lessliable to closely contact together.

In the deaeration valve 1 according to the present embodiment, as shownin FIG. 1, the aforementioned seal sections 21 and 22 comprise a firstside seal section 21 which has a linear shape extending in the up/downdirection in the figure, following the left-hand edge of the valve films11, 12 in the figure, and a second side seal section 22 which is formedtowards the right-hand side from the first side seal section 21 in thefigure, and which extends in the up/down direction in the figure, but isformed in a bent fashion.

The second side seal 22 in the present embodiment comprises threesections; an introduction section 221, an intermediate section 222 andan expulsion section 223, from the top downwards in the drawings. Theintroduction section 221 is disposed toward the inlet side of the airpassage 2, and the expulsion section 223 is disposed toward the outletside of the air passage 2.

Here, the upward flow side end 221 a of the introduction section 221 andthe upward flow side end 21 a of the first side seal section 21 form theinlet 2 a of the air passage. Specifically, the inlet 2 a is defined bythe straight line which links the respective end sections 221 a and 21a. Further, the downward flow side end 223 b of the expulsion section223 and the downward flow side end 21 b of the first side seal section21 form the outlet 2 b of the air passage. More specifically, the outlet2 b is defined by the straight line which links the respective endsections 223 b and 21 b. The intermediate section 222 is connectedbetween the introduction section 221 and the expulsion section 223.

In the second side seal 22, the intermediate section 222 is formed moreclosely to the first side seal section 21 than the introduction section221, and the expulsion section 223 is formed more closely to the firstside seal section 21 than the intermediate section 222. Accordingly, thedimension L2 b between the respective end sections of the first sideseal section 21 and the second side seal section 22 on the outlet sideof the air passage is smaller than the dimension L2 a between therespective end sections on the inlet side. In other words, the width ofthe air passage 2 in the present embodiment narrows toward the downwardflow side.

In the present embodiment, each of the introduction section 221, theintermediate section 222 and the expulsion section 223 is formed bystraight lines, and as shown in FIG. 1, the introduction section 221 andthe expulsion section 223 are formed in parallel with the first sideseal section 21.

The mode of the seal sections 21 and 22 is not limited to that shown inthe present embodiment, and it may be modified in various ways. Forexample, it is also possible to dispose the respective seal sections 21and 22 in a parallel fashion, as shown in FIGS. 7(A), 7(B) and 7(H), byforming both of the seal sections 21 and 22 as straight lines, in such amanner that the air passage 2 does not narrow, and it is also possibleto cause the air passage 2 to narrow by forming the second side sealsection 22 as a straight line extending in an oblique direction, asshown in FIG. 7(E). Further, it is also possible to form the second sideseal section 22 as a continuous curved line, as shown in FIG. 7(F).Moreover, in the case of the present embodiment, the first side sealsection 21 is formed in a straight line and the second side seal section22 is curved, but as shown in FIG. 7(D), it is also possible to formboth of the seal sections 21 and 22 in curved lines, in a laterallysymmetrical configuration.

In the deaeration valve 1, as shown in FIG. 1(A), a non-sealed section 3is formed outside the air passage 2. This non-sealed section 3 consistsof a passage extension section 31 and a free section 32. Here, thepassage extension section 31 is a portion located on the downward flowside from the outlet 2 b of the air passage 2, and air that has passedthrough the air passage 2 continues to pass through this section. On theother hand, the free section 32 is a section in which the valve films 11and 12 are closed by a unifying seal 64 formed when installing the valveon the compression bag 5, as shown in FIG. 6, for example, and air doesnot pass through this section as it does through the air passage 2. Asshown in FIGS. 2(A) and 2(D), the air flow into the air passageextension section 31 from the air passage 2 may pass through the freesection 32.

Here, in the present embodiment, the downward flow side end 223 b of theexpulsion section 223 of the second side seal section 22 is formedfurther toward the upward flow side (the upper side in the figure) thanthe downward flow side end 21 b of the first side seal section 21.Therefore, the passage extension section 31 in the deaeration valve 1according to the present embodiment is a triangular-shaped portiondefined by three lines; the outlet 2 b, namely, the line linking thedownward flow side end 21 b [changed from 21 a] of the first side sealsection 21 and the downward flow side end 223 b of the expulsion section223 of the second side seal section 22, the downward flow side edges 11b and 12 b of the valve films 11 and 12, and the line of extension 223 cof the second side seal 22 on the downward flow side of the expulsionsection 223 of the second side seal 22 (indicated by a broken line).When the air passage 2 is closed as shown in FIG. 1(C), the valve films11 and 12 can closely contact together in this passage extension section31, as the valve films 11 and 12 in the air passage 2.

In the present embodiment, as described above, by forming a first sideseal section 21 further in the downward direction with respect to thesecond side seal section 22 in the figure, the first side seal 21 servesas a bone for the valve films 11 and 12 and prevents the valve films 11and 12 from curling in the passage extension section 31, and hence thereis no obstacle to close contact of the valve films 11 and 12 in thepassage extension section 31.

As shown in FIGS. 7(A), 7(C) and 7(H), it is also possible to separatethe downward flow side edges 11 b and 12 b of the valve films 11 and 12from the downward flow side end 21 a of the first side seal section 21,in such a manner that the respective seal sections 21 and 22, and thedownward flow side edges 11 b and 12 b of the valve films 11 and 12 arenot connected.

The free section 32 is adjacent to both the air passage 2 and thepassage extension section 21. In other words, as shown in FIG. 1, in thenon-sealed section 3, the portion to the left-hand side of the downwardflow side line of extension 223 c of the expulsion section 223 of thesecond side seal 22 forms the passage extension section 31, while theportion to the right-hand side forms the free section 32.

The passage extension section 31 and the free section 32 are connected,and distortion of the valve films 11 and 12 in the passage extensionsection 31 can be absorbed in the free section 32. Therefore, at leastin the passage extension section 31, the tension of the valve films canbe stabilized, consequently eliminating slackening or wrinkles, and thevalve films 11 and 12 can be made reliably to closely contact together.Inverse flow of the air in the air passage 2 can be effectivelyprevented by locating the portion where the valve films 11 and 12closely contact together in this way adjacent to the downward flow sideof the air passage 2.

As described above, in order that a portion able to absorb distortion ofthe valve films 11 and 12 is ensured in the free section 32, it isnecessary for the unifying seal 64 formed in installation to thecompression bag 5, or for the seals formed separately from this in thefree section 32 in order to prevent passage of air between the valvefilms 11 and 12, to be formed from the upward flow side edges 11 a and12 a of the valve films 11 and 12 in the free section 32, up to thedownward flow side end 223 b of the expulsion section 223 of the secondside seal 22, and a gap must be provided between these seals and thedownward side edges 11 b and 12 b of the valve films 11 and 12.

Further, it is not essential to form the free section 32, and dependingon the circumstances, it is possible for the non-sealed section 3 tocomprise the passage extension section 31 only. In this case, thepassage extension section 31 is a square portion defined by the fourlines; the outlet 2 b, namely, the line linking the downward flow sideend 21 a of the first side seal section 21 and the downward flow sideend 223 b of the second side seal section 22, the downward flow sideedges 11 b and 12 b of the valve films 11 and 12, the downward flow sideline of extension 21 c of the first side seal 21 and the downward flowside line of extension 223 c of the second side seal 22.

Even in this case, it is possible to eliminate distortion of the valvefilms 11 and 12 in the passage extension section 31, by staggering thevalve films 11 and 12 in the left/right direction in the figure, in thepassage extension section 31, and like the foregoing, the tension of thevalve films can be stabilized, and the valve films 11 and 12 can be madereliably to closely contact together without slackening or wrinkles.

In addition to the foregoing, in the present embodiment, the width ofthe air passage 2 is narrowed toward the downwards flow side, and thelateral dimension of the free section 32 is greater in the figure thanthe lateral dimension of the passage extension section 31 in FIG. 1(A).More specifically, in the present embodiment, the lateral dimension ofthe passage extension section 31 is 10 mm in the figure, whereas thelateral dimension of the free section 32 is 70 mm in the figure. Thus,by forming the free section 32 larger than the passage extension section31 in this way, the above-described absorption of distortion in the freesection 32 is performed more effectively.

Here, the movement of the valve films 11 and 12 with the air passage 2closed will be described in detail. As shown in FIG. 6, explained willbe a state where a deaeration valve 1 is installed to the compressionbag 5 described below. For description, the cross-sectional views inFIG. 2 to FIG. 4 exaggerate the size in the vertical direction of thefigure, compared to an actual size.

First, when the air present inside the storage section 62 of thecompression bag 5 is removed, the opening 61 is closed by the closingmeans 61 a, and pressure is applied from outside the bag by rolling upthe storage section 62 or doing like this. The air inside the storagesection 62 forms an air flow f1 and passes through the air passage 2 ofthe deaeration valve 1, being expelled to the exterior of the bag.During this action the valve films 11 and 12 are pushed forcibly apartas shown in FIG. 2(B) of an end view along B-B. Here, as describedabove, since the second side seal section 22 ends at an intermediatepoint of the passage extension section 31, the air flow f1, as shown bythe arrow in FIG. 2(A), also flows to the free section 32. FIG. 2(C)shows a sectional view along C-C in the lateral direction of the airpassage 2 of the deaeration valve 1 in this case, while FIG. 2(D) showsa sectional view along D-D in the lateral direction of the passageextension section 31 and the free section 32 of the deaeration valve 1in this case.

Next, FIGS. 3(A) and 3(B) show a momentary state when the aforementioneddeaeration action has ended and the air flow f1 has ceased to passthrough the air passage 2. In this case, the interior of the storagesection 62 of the compression bag 5 assumes a state of negative pressuredue to the expulsion of the air therein. Consequently, as shown in FIG.3(B) of a sectional view along E-E, a force X acts on the valve films 11and 12 so as to pull them towards the storage section 62, and hence thevalve films 11 and 12 closely contact together. This close contact ofthe valve films 11 and 12 occurs within a very short period of time, andhence there is virtually no inverse flow of air through the air passage2 during the movement of the valve films 11 and 12.

Next, FIGS. 4(A) to 4(D) show the cases where the valve films 11 and 12described above closely contact together, and the air passage 2 isclosed. As shown in FIG. 4(B) of a sectional view along F-F, the valvefilms 11 and 12 normally closely contact to each other, thus closing theair passage 2 completely, but as shown in FIG. 4(C) of a sectional viewalong G-G in the lateral direction of the air passage 2 of thedeaeration valve 1, a gap Y may occasionally arise between the valvefilms 11 and 12 due to slackening of the valve films 11 and 12. This isbecause the valve films 11 and 12 are fixed by the first side sealsection 21 and the second side seal section 22, and hence relativedisplacement between the valve films 11 and 12 is restricted. On theother hand, in the passage extension section 31, the second side sealsection 22 is not present, and therefore the valve films 11 and 12 areable to move in the direction of arrow Z, as shown in FIG. 4(D) of asectional view along H-H in the lateral direction of the air passage 2of the deaeration valve 1. Consequently, it is possible to absorb anydisplacement between the valve films 11 and 12 in the free section 32,and therefore, no gaps Y such as that in FIG. 4(C) occur, and the valvefilms 11 and 12 can be made reliably to closely contact together in thepassage extension section 31.

Even in the deaeration valve 1 comprising of three films 11 to 13illustrated in FIG. 5, like the foregoing, the valve films 11 and 12closely contact together due to a force X that pulls them towards thestorage section 62, but in addition to this, the intermediate film 13and the front side valve film 11 closely contact together, as shown inFIG. 5(C), due to the aforementioned force X (in order to aidunderstanding, the valve films 11 and 12 are depicted in a separatedfashion in FIG. 5(C)). Thereupon, a pocket-shaped space 2 c may beprovided between each of the valve films 11 and 12 and the intermediatefilm 13, but even in this case, the air flow f2 heading to flowinversely from the outlet 2 b to the inlet 2 a of the air passage 2remains in this pocket-shaped space 2 c and does not pass through theair passage 2.

Here, it is desirable that the dimension of the inlet 2 a of the airpassage 2 is large, since the air is guided smoothly into the airpassage 2. Contrary to this, it is desirable that the dimension of theoutlet 2 b of the air passage 2 is small, since distortion is not liableto occur in the valve films 11 and 12. And, it is desirable that thedimension of the air passage 2 from the inlet 2 a to the outlet 2 b islarge in order to ensure that the valve films 11 and 12 closely contacttogether in a reliable fashion. However, the dimensions of therespective sections of the deaeration valve 1 will be determined bytaking things into consideration, because balancing the dimensions withthe size of the compression bag 5 to which the valve is applied, orensuring a large storage section 62 in the compression bag 5 arefunctionally required.

With respect to the aforementioned dimensions, desirably, the lateraldimension between the introduction section 221 and the first side sealsection 21 in the vicinity of the inlet 2 a of the air passage 2 istaken to be 20 mm-60 mm. In the present embodiment, it is set as 30 mm.Further, desirably, the lateral dimension between the expulsion section223 and the first side seal section 21 in the vicinity of the outlet 2 bof the air passage 2 is taken to be 5 mm-30 mm. In the presentembodiment, it is set as 10 mm. Desirably, the dimension of thedeaeration valve 1 in the vertical direction in the figure is 30 mm-100mm. In the present embodiment, the dimension falls on the upward flowside edge 12 a and the downward flow side edge 12 b of the rear sidevalve film, and is taken as 45 mm.

As described above, since the distance between the first side sealsection 21 and the second side seal section 22 can be set freely, it ispossible to design a deaeration valve 1 capable of passing the optimumamount of air through the air passage 2 in accordance with the size ofthe compression bag 5 to which the deaeration valve 1 is installed.

In the present embodiment, the dimension of the deaeration valve 1 inthe lateral direction in the figure is taken as 80 mm, and the freesection 32 has a dimension sufficiently larger than the passageextension section 31, but depending on the circumstances, it is alsopossible to make the right-hand ends of the valve films 11 and 12 in thefigure coincide with the introduction section 221 of the second sideseal section 22, as shown in FIG. 7(G), in such a manner that the freesection 32 is formed solely between the expulsion section 223 of thesecond side seal section 22 and the right-hand ends of the valve films11 and 12 in the figure.

Here, as shown in FIGS. 1(A)-1(C), the upward flow side edge 11 a of thefront side valve film 11 and the upward flow side edge 12 a of the rearside valve film 12, both of the valve films being placed one on theother, are disposed in staggered positions, displaced towards the upwardflow side and the downward flow side. In the present embodiment, theupward flow side edge 11 a of the front side valve film 11 is disposedtowards the downward flow side. The aforementioned displacement isdesirably set within the range of 1 mm to 10 mm, and more desirably, 3mm to 5 mm. This displacement is not essential in the present invention,but is desirably to be provided. Also, this displacement may be called“step difference”.

The displacement between the edges 11 a and 12 a is provided in order toavoid the inlet 2 a of the air passage 2 from being sealed due todislocation of the unifying seal section 64 that is a heat seal formedbetween the deaeration valve 1 and each of the bag films 51 and 52 whenbonding the deaeration valve 1 onto the bag films 51 and 52 as describedhereinafter. Further, it also serves to make the valve films 11 and 12readily open up during deaeration, in such a manner that the air flow f1can be smoothly introduced to the air passage 2 during deaeration.

In the present embodiment, as shown in FIG. 1(A), the dimension of thevalve films 11 and 12 in the vertical direction in the figure is thesame in the sections where the air passage 2 is formed and the othersections of the films, but it is effective as long as a displacement asdescribed above exists in the section where the air passage 2 is formed.

An inert liquid 4, such as silicon oil, is at least partly disposedbetween the inner surfaces of the valve films 11 and 12. This liquid 4,due to its viscosity, has effects of reinforcing close contact betweenthe valve films 11 and 12 when the air passage 2 is sealed. Desirably,the viscosity of the liquid 4 has a low viscosity, since it is difficultto open up the air passage 2 if the viscosity is too high. However, evenit is low, needed is the viscosity of a level that does not allow theliquid to leak out from the air passage 2.

Next, the compression bag 5 equipped with the aforementioned deaerationvalve 1 will be described. This compression bag 5 is formed with atleast two bag films 51 and 52, which are made of synthetic resin andplaced one on the other, by partly bonding the films together. Thecompression bag 5, as shown in FIG. 6, has a storage section 62 thatincludes an opening 61 and is able to contain an item such as clothing,and a deaeration opening 63 for removing air in the storage section 62other than the opening 61. In the compression bag 5 according to thepresent embodiment, the opening 61, provided on the upper side in thefigure, can be hermetically closed by a closing device, such as afastener 61 a, which closes by way of interlocking a recessed strip witha projecting zip. The deaeration openings 63 are provided on the lowerside of the compression bag 5 in the figure. However, the opening 61 andthe deaeration openings 63 can be positioned freely as long as they donot affect in the status where the deaeration valve 1 is attached, asdescribed hereinafter. As regards the number of deaeration openings 63,in the compression bag 5 according to the present embodiment, threedeaeration openings 63 are provided, but this number may be varied.Further, the bag films 51 and 52 according to the present embodimenthave a rectangular shape in a plan view, but they may be also formed ina circular shape, a polygonal shape, or other forms variously.

The aforementioned deaeration valve 1 is, between the storage section 62and a deaeration opening 63, attached with the inlet side of the airpassage 2 towards the top and the outlet side towards the bottom. In thepresent embodiment, it is positioned within a range of 60 mm from thebottom of the compression bag 5. The deaeration valve 1 is attachedthrough forming an integral seal section 64 in which the valve films 11and 12, and the bag films 51 and 52 are bonded together. Except the airpassage 2, air does not flow between the storage section 62 and thedeaeration opening 63 by forming this unifying seal section 64.

In the present embodiment, elongate films are used as valve films 11 and12, and a plurality of deaeration valves 1 are disposed parallel in thelengthwise direction of these valve films, in such a manner that airpassages 2 and free sections 32 are respectively adjacent, as shown inFIG. 6. Consequently, combined with similarly elongate bag films 51 and52, compression bags 2 [should be 5] can be continuously manufactured,resulting in enhancement of productive efficiency. Moreover, when aplurality of deaeration valves 1 are aligned in this fashion, the numberof air passages 2 per compression bag 5 can be readily increased as thecompression bag 5 becomes larger, especially extending the lateraldimension, and hence it is not difficult in deaeration with a large-sizecompression bags 5.

Aforementioned unifying seal section 64 is formed by heat sealing.Therefore, a heat resistant coating 7 is provided at least on part ofthe inner surfaces of the valve films 11 and 12 in the air passage 2 ofthe deaeration valve 1, further coinciding with the unifying sealsection, more specifically, as shown in FIG. 1(B), in the vicinity ofthe inlet 2 a of the air passage 2, in order that the air passage 2 isnot closed off due to melting of the valve films 11 and 12 under theeffects of the heat applied during heat sealing. Here, “heat resistant”means a property whereby the material degenerates, by fusion, or thelike, due to heat of the heat sealing operation, without affectingsurrounding members, such as valve films 11 and 12.

In a deaeration valve 1 consisting of three films 11 to 13 asillustrated in FIG. 5, a heat resistant coating 7 is provided on thesurface of the valve film 11 or the intermediate film 13 facing onto thespace which is formed when the valve is opened and where the air flow f1passes, specifically, on the surface adjacent to the inlet 2 a of theair passage 2, as shown in FIG. 5(B).

In the compression bag 5 according to the present embodiment, thestorage section 62 comprises an item storage portion 62 a where an itemis actually contained, and an air introduction portion 62 b which liesbetween the item storage portion 62 a and the deaeration valve 1,wherein valve protection seals 67 are formed at the boundary betweenthese portions 62 a and 62 b. The valve protection seals 67 areintermittently formed by bonding the bag films 51 and 52 together. Theinterval at which the valve protection seals 67 are formed may be suchthat air is allowed to pass between the portions 62 a and 62 b and theseals do not affect the introduction of air into the air passages 2. Inthe present embodiment, the dimension of each valve protection seal 67is 10 mm in the left/right direction in the figure, and the intervalbetween the valve protection seals 67 is 25 mm. Further, the form of thevalve protection seals 67 can be modified variously, however, it isdesirable they have a form, for example, such as a circular form, whichmakes less resistance when air passes between the portions 62 a and 62b.

Forming of the valve protection seals 67 in this way enables the itemsuch as clothing contained in the item storage portion 62 a to beprevented from being sucked into the air passages 2 by the air flows f1.And, even when stuffing of the item into the item storage portion 62 amakes the bag films 51 and 52 curve, portions of the bag films 51 and52, namely, the downward flow side films 51 a and 52 a situated in theair introduction portion 62 b, do not follow the curving, achieving anon-deformed state. Consequently, it is possible for the deaerationvalves 1 to maintain a flat state without being affected by the stuffeditem, resulting in opening and closing the air passages 2 reliably.However, it is not essential to form these valve protection seals 67,and they may be omitted.

Next, a concrete description is given of a method of manufacturing thedeaeration valve 1 shown in FIG. 1 and the compression bag 5 shown inFIG. 6.

A long film rolled up in the form of a roll is used for the valve films11 and 12 according to the present embodiment. Specifically, a filmhaving a width of 45 mm and a length of 1000 m is used.

First, a heat resistant coating 7 is coated by means of gravure printingor the like onto part of the surface of the rear side valve film 12facing the front side valve film 11, specifically, in the vicinity ofthe position where the inlet 2 a of the air passage 2 is to be formed.The width dimension of the front side valve film 11 is then reduced byapproximately 5 mm. This dimensional difference forms theabove-described displacement of the edges 11 a and 12 a.

Either of the valve films 11 and 12 is coated with silicon oil 4 ontothe surface of the portion where an air passage 2 is to be formed. Thiscoating operation may be performed by painting with a brush or the like,or by spraying.

The two valve films 11 and 12 are then placed one on the other, and afirst side seal section 21 and a second side seal section 22 are formedby heat sealing the films, as illustrated in FIG. 1(A). The first sideseal section 21 is formed throughout the whole width of the valve films11 and 12 in this operation. On the other hand, the downward flow sideend section 223 b of the second side seal section 22 does not coincidewith the downward flow side edges 11 b and 12 b of the valve films 11and 12, thus providing a gap. This gap is the line of extension 223 c ofthe seal section 22, which forms the boundary between the passageextension section 31 and the free section 32 described above.

The deaeration valve 1 formed, as shown in FIG. 1(A), in this way issandwiched between the bag films 51 and 52, and the unifying sealsection 64 is formed, thereby unifying the valve and the bag films. Sideseal sections 65 are then formed on the perimeter edges of the bag films51 and 52, except the portions where the opening 61 and the deaerationopening 63 are to be formed. At the opening 61, a fastener 61 a of aclosing means is attached. Further, as needed, a slider 8 is provided toaide opening and closing of the zip fastener 61 a. Thus the compressionbag 5 is completed.

Depending on conditions between the position where the heat resistantcoating 7 is deposited in the deaeration valve 1, and the bag films 51and 52, the side seal sections 65 are not formed at the portion wherethe heat resistant coating 7 overlaps, thus heat sealing is ineffective,and hence air may leak. In the present embodiment, in order to preventdisadvantage like this, inner seal sections 66 are further formed to theinner side from the side seal sections 65 formed on the right andleft-hand edges of the compression bag 5 in the figure. In other words,the deaeration valve 1 is sure to be bonded to the bag films 51 and 52at the side seal section 65 and/or inner seal section 66, except theportion such as the free section 32 where the heat resistant coating 7is provided.

The deaeration valve 1 is not fixed to the bag films 51 and 52 at anypositions other than the unifying seal section 64, the side sealsections 65 and the inner seal sections 66. Therefore, as describedabove, the free section 32 is hardly disturbed in absorbing distortionof the valve films 11 and 12 in the passage extension section 31.

The present invention has the following beneficial effects.

In the aspect according to claim 1, distortion in the valve films 11 and12 in the passage extension section 31 can be eliminated, and therefore,at least in this passage extension section 31, the tension of the valvefilms can be stabilized, and the valve films 11 and 12 can be reliablymade to closely contact together without slackening or wrinkles. Sincethe reliable portion of close contact like this between the valve films11 and 12 is located adjacent to the outlet 2 b of the air passage 2, itis possible to effectively prevent inverse flow of air in the airpassage 2. Consequently, a deaeration valve that is capable of effectiveprevention of inverse air flow in spite of a simple structure isprovided.

In the aspect according to claim 2, in addition the foregoing effects, afree section 32, which is a section adjacent to the passage extensionsection 31, or adjacent to the air passage 2 and the passage extensionsection 31, is formed, and the parts of the valve films 11 and 12forming the passage extension section 31 and the free section 32 form asingle body. Therefore, distortion of the valve films 11 and 12 in the131 can be absorbed in the free section 32, whereby the tension in thevalve films can be stabilized, at least in this passage extensionsection 31, and the valve films 11 and 12 can be reliably made toclosely contact together without slackening or wrinkles.

In the aspect according to claim 3 or 4, in addition to the effects ofthe aspects above, the dimension L2 b between the respective endsections of the first side seal section 21 and the second side sealsection 22 on the outlet side of the air passage 2 is made smaller thanthe dimension L2 a between the respective end sections on the inletside, and therefore it is possible to form the free section 32 to alarger size than the passage extension section 31, and a deaerationvalve in which distortion is absorbed more effectively in the freesection 32 is provided.

In the aspect according to claim 5, in addition to the effects of theaspects described in claims 1 to 4, the upward flow side edge 11 a, 12 aof the valve film 11, 12 on one side and the upward flow side edge 12 a,11 a of the valve film 12, 11 on the other side are disposed instaggered positions, towards the upward flow side and the downward flowside respectively, and therefore, it is possible to prevent the inlet 2a of the air passage 2 from being bonded and closed off, when thedeaeration valve 1 is bonded onto the bag films 51 and 52 that form thecompression bag 5. Further, this also has the action of facilitatingopening of the valve films 11 and 12 during deaeration, in such a mannerthat the air flow f1 is smoothly introduced into the air passage 2during deaeration.

In the aspect according to claim 6, in addition to the effects of theaspects described in any one of claims 1 to 5, an inert liquid 4 such assilicon oil is provided on at least part of the inner surfaces of thevalve films 11 and 12 in the air passage 2, and therefore close contactbetween the valve films 11 and 12 with the air passage 2 closed can bereinforced by the viscosity of the liquid 4.

In the aspect according to claim 7 is provided a compression bagequipped with a deaeration valve capable of stabilizing tension of thevalve films 11 and 12 and effective prevention of inverse air flow inspite of a simple structure, and since a heat resistant coating 7 isprovided on at least part of the inner surfaces of the valve films 11and 12 in the air passage 2 of the deaeration valve 1, then it ispossible to provide a compression bag equipped with a deaeration valvein which the air passage 2 is not closed off as a result of melting ofthe valve films 11 and 12 due to the effects of heat during heat sealingfor forming the compression bag 1.

In the aspect according to claim 8, in addition to the effects of theaspect described in claim 7, long films are used for the valve films 11and 12, and a plurality of the aforementioned deaeration valves 1 arearranged in the lengthwise direction of the valve films 11 and 12 insuch a manner that the respective air passages 2 and free sections 32are adjacent, and therefore, combined with similarly elongate bag films51 and 52, it is possible to continuously manufacture compression bags2, resulting in enhancement of productive efficiency. Further, byarranging a plurality of deaeration valves 1 in this way, it is possibleto readily increase the number of air passages 2 per compression bag 5,as the size, and especially, the width, of the compression bag 5increases, and therefore it is possible to provide a compression bagequipped with a deaeration valve in which there is no difficulty inperforming deaeration, even in the case of a large compression bag 5.

In the aspect according to claim 9, in addition to the effects of theaspects described in claim 7 or 8, valve protection seals 67 are formedat the boundary between an item storage portion 62 a and an airintroduction portion 62 b, and therefore it is possible to provide acompression bag equipped with a deaeration valve capable of preventingthe item such as clothing contained in the item storage portion 62 afrom being sucked into the air passage 2. Further, even when the bagfilms 51 and 52 are caused to curve when an item is stuffed into theitem storage portion 62 a, the portions of the bag films 51 and 52located in the air introduction portion 62 b do not curve accordingly,and can be maintained in a non-deformed state. Therefore, it is possibleto maintain the deaeration valve 1 in a flat state, without beingaffected by the contained item, and hence it is possible to provide acompression bag equipped with a deaeration valve in which the airpassage 2 can be opened and closed in a reliable manner.

1. A deaeration valve (1) comprising two valve films (11, 12) ofsynthetic resin that are placed one on the other and bonded at partsthereof together, thereby forming an air passage (2) that allows to passair through the valve films from an inlet (2 a) to an outlet (2 b), theair passage being is closable by the valve films (11, 12) that closelycontact together, wherein the air passage (2) is defined by two sealsections (21, 22) formed by bonding the valve films (11, 12) together,the inlet (2 a) of the air passage (2) being defined by the straightline linking respective upward flow side end sections (21 a, 221 a) ofthe seal sections (21, 22), while the outlet (2 b) of the air passage(2) being defined by the straight line linking respective downward flowside end sections (21 b, 223 b) of the seal sections (21, 22), and atleast one of the downward flow side end sections (21 b, 223 b) of theseal sections (21, 22) and the downward flow side edges (11 b, 12 b) ofthe valve films (11, 12) are separated, wherein a passage extensionsection (31) is provided on the downward flow side of the air passage(2), the passage extension section (31) being defined by the outlet (2b) of the air passage (2), the line of extension (21 c, 223 c) of theseal section (21, 22) on the downward flow side from at least one of thedownward flow side end section (21 b, 223 b) of the seal sections (21,22), and the downward flow side edges (11 b, 12 b) of the valve films(11, 12), wherein the valve films (11, 12) are not bonded together atthe lines of extension (21 c, 223 c).
 2. The deaeration valve 1according to claim 1, further comprising a non-sealed section (3)comprising a passage extension section (31) and a free section (32), thefree section (32) being adjacent to the passage extension section (31)or to the air passage (2) and the passage extension section (31), thepassage extension section (31) and the free section (32) being boundedby the line of extension (21 c, 223 c) that defines the passageextension section (31), wherein the portions of valve film (11, 12)constituting the passage extension section (31) and the free section(32) form a single body.
 3. The deaeration valve according to claim 1,wherein the dimension (L2 b) between the respective end sections of thefirst side seal section (21) and the second side seal section (22) atthe outlet of the air passage (2) is smaller than the dimension (L2 a)between the respective end sections at the inlet of the air passage (2).4. The deaeration valve according to claim 3, wherein the first sideseal section (21) has a linear form, and the second side seal section(22) comprises three sections that are an introduction section (221), anintermediate section (222), and an expulsion section (223), theintermediate section (222) connecting between the introduction section(221) and the expulsion section (223), and regarding the second sideseal section (22), the intermediate section (222) is formed closer tothe first side seal section (21) than the introduction section (221),further the expulsion section (223) being formed closer to the firstside seal section (21) than the intermediate section (222), wherein theinlet (2 a) of the air passage (2) is defined by the upward flow sideend section (221 a) of the introduction section (221) and the upwardflow side end section (21 a) of the first side seal section (21), whilethe outlet (2 b) of the air passage (2) is formed by the downward flowside end section (223 b) of the introduction section (223) and thedownward flow side end section (21 b) of the first side seal section(21), wherein the downward flow side end section (223 b) of the secondside seal section (22) is formed further towards the upward flow sidethan the downward flow side end section (21 b) of the first side sealsection (21), and the free section (32) being formed adjacent to the airpassage (2) and the passage extension section (31) is provided.
 5. Thedeaeration valve according to claim 1, wherein, in the air passage (2),the upward flow side edge (11 a, 12 a) of the valve films (11, 12) thatare placed one on another, and the upward flow side edge (12 a, 11 a) ofthe other of the valve films (12, 11) are disposed at least respectivelyin staggered positions towards the upward flow side and the downwardflow side.
 6. The deaeration valve according to claim 1, wherein aninert liquid (4) such as silicon oil is disposed on at least part of theinner surfaces of the valve films (11, 12) in the air passage (2).
 7. Acompression bag equipped with a deaeration valve, being a compressionbag (5) formed with at least two bag films (51, 52) of synthetic resinthat are placed one on the other and bonded at parts thereof together,thereby comprising a storage section (62) provided with an opening (61),the storage section being able to contain an item for storage, and adeaeration opening (63) for removing air in the storage section (62)other than the opening (61), wherein the respective bag films (51, 52)have a rectangular shape in a plan view, and the opening (61) isprovided in the upper part of the compression bag (5) and ishermetically closable by a closing device (61 a), while the deaerationopening (63) is provided in the lower part of the compression bag (5),wherein a deaeration valve (1) according to any one of claims 1 to 6 isinstalled between the storage section (62) and the deaeration opening(63) with the inlet side of the air passage (2) towards the top and theoutlet side towards the bottom, the installation of the deaeration valve(1) being achieved by forming a unifying seal section (64) where thevalve films (11, 12) and the bag films (51, 52) are bonded together, airbeing prevented from flowing between the storage section (62) and thedeaeration opening (63) except through the air passage (2), wherein aheat resistant coating (7) is disposed on at least part of the innersurfaces of the valve films (11, 12) in the air passage (2), the partbeing taken in a portion that coincides with the unifying seal section(64).
 8. The compression bag equipped with a deaeration valve accordingto claim 7, wherein elongate films are used for the valve films (11, 12)and a plurality of the deaeration valves (1) are disposed parallel inthe lengthwise direction of the valve films (11, 12) in such a mannerthat the air passages (2) and free sections (32) are respectivelyadjacent.
 9. The compression bag equipped with a deaeration valveaccording to claim 7, wherein the storage section (62) comprises an itemstorage portion (62 a) and an air introduction portion (62 b), theportions (62 a, 62 b) being bounded by a valve protection seal (67), thevalve protection seal (67) being formed by bonding the bag films (51,52) together, wherein air is allowed to pass between the item storagesection (62 a) and the air introduction portion (62 b).
 10. Thedeaeration valve according to claim 2, wherein the dimension (L2 b)between the respective end sections of the first side seal section (21)and the second side seal section (22) at the outlet of the air passage(2) is smaller than the dimension (L2 a) between the respective endsections at the inlet of the air passage (2).
 11. The deaeration valveaccording to claim 2, wherein, in the air passage (2), the upward flowside edge (11 a, 12 a) of the valve films (11, 12) that are placed oneon another, and the upward flow side edge (12 a, 11 a) of the other ofthe valve films (12, 11) are disposed at least respectively in staggeredpositions towards the upward flow side and the downward flow side. 12.The deaeration valve according to claim 3, wherein, in the air passage(2), the upward flow side edge (11 a, 12 a) of the valve films (11, 12)that are placed one on another, and the upward flow side edge (12 a, 11a) of the other of the valve films (12, 11) are disposed at leastrespectively in staggered positions towards the upward flow side and thedownward flow side.
 13. The deaeration valve according to claim 4,wherein, in the air passage (2), the upward flow side edge (11 a, 12 a)of the valve films (11, 12) that are placed one on another, and theupward flow side edge (12 a, 11 a) of the other of the valve films (12,11) are disposed at least respectively in staggered positions towardsthe upward flow side and the downward flow side.
 14. The deaerationvalve according to claim 2, wherein an inert liquid (4) such as siliconoil is disposed on at least part of the inner surfaces of the valvefilms (11, 12) in the air passage (2).
 15. The deaeration valveaccording to claim 3, wherein an inert liquid (4) such as silicon oil isdisposed on at least part of the inner surfaces of the valve films (11,12) in the air passage (2).
 16. The deaeration valve according to claim4, wherein an inert liquid (4) such as silicon oil is disposed on atleast part of the inner surfaces of the valve films (11, 12) in the airpassage (2).
 17. The deaeration valve according to claim 5, wherein aninert liquid (4) such as silicon oil is disposed on at least part of theinner surfaces of the valve films (11, 12) in the air passage (2). 18.The compression bag equipped with a deaeration valve according to claim8, wherein the storage section (62) comprises an item storage portion(62 a) and an air introduction portion (62 b), the portions (62 a, 62 b)being bounded by a valve protection seal (67), the valve protection seal(67) being formed by bonding the bag films (51, 52) together, whereinair is allowed to pass between the item storage section (62 a) and theair introduction portion (62 b).